One of the unholy trinity of internet pictures which all must witness to be 'jaded internet users' (tubgirl, goatse, and lemonparty), lemonparty is probably the tamest of the three by just being hardcore old man gay orgy sex. Believe me, the other two are worse.

Closly related to the infamous "tubgirl" site. If one goes to www.lemonparty.org, you will withness a old-man threesome. One sucking dick and the other two making out. Possibly the most horrifing thing one man can ever witness.